海南乐东洪帽剖面鹿母湾组中,首次发现丰富的由沟鞭藻和疑源类组成的浮游微体植物群,共计10属25种(沟鞭藻6属20种,包括1新种。疑源类4属5种),组成以Laciniadinium granulatum-Granodiscus granulatus为特征的藻类组合。根据组合中主要属种的生长环境,认为海南乐东鹿母湾组沉积时期主要为干旱的热带(或亚热带)气候环境;有些海相沟鞭藻的发现,不能完全排除鹿母湾组沉积受弱海水的影响,水域较平静。 A total of 25 genera of 10 genera (25 species in 6 genera of Daphniphyllum, including 1 new species) were found for the first time in the Luodong Bay Formation of Ledonghong Cap in Hainan Province. , 4 genera and 4 species of doubtful genus), which formed the algae assemblage characterized by Laciniadinium granulatum-Granodiscus granulatus. According to the growth environment of the main species in the assemblage, it is believed that the sedimentation period of the Luodongwan Formation of the Hainan Ledong is mainly arid tropical (or subtropical) climate environment; some of the marine dinoflagellates can not completely exclude the deposition Weak sea water, the water is more calm.